Regenerate is a nice mix of flavor and function here, giving our first crack at Logan some much-needed resilience
Niv-Mizzet has a couple of ways to make it work, but the concept is very simple
Sometimes you have clunky draws with multiple Traverse, Ishkanah and few removal spells and you need to hit delirium, so you need some card that does that pretty much by itself (Demon,Vessel), or you have draft deck with Lay of the Land, Thraben Purebloods and removal spells
Youve accelerated mana if you flip it, and being able to tap Azcanta to grab an answer at instant speed is the thing control mages dreams are made of
Getting a role token does make a difference, and a card like this also triggers Celebration, so it does some nice stuff for a couple different decks in the format